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Source Studies from Isolated Seismic Signals

Ben-Menahem, Ari (1965) Source Studies from Isolated Seismic Signals. In: Proceedings of the VESIAC Conference on the Current Status and Future Prognosis for Understanding the Source Mechanism of Shallow Seismic Events in the 3 to 5 Magnitude Range. University of Michigan , Ann Arbor, MI, pp. 85-108. ISBN 2661246.

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Since 1960, new methods have been developed for extracting source information from surface-wave signals in the frequency range 2 mc/sec to 20 mc/sec. Recently, similar methods were successfully applied to body waves in the frequency range 10 mc/sec to 100 mc/sec. The author outlines the historical development of these ideas and demonstrates the present state of the art by a few examples which show clearly the success, as well as the limitations, of existing methods. Some new data are presented. Source mechanisms of the Queen Charlotte Island earthquake of 22 August 1949, the Sanriku earthquake of 2 March 1933, and the Iran shock of 1 September 1962 are revealed from analyses of mantle surface waves. As a counterexample, the source mechanism of a deep Banda Sea shock is derived from spectra of P and S waves recorded by stations of the World- Wide Standard Seismograph Network. Emphasis is placed on the derivation of the force system and the time function at the source by the phase-equalization method, and the source dimensions and rupture speed by the directivity method.

Item Type:Book Section
Additional Information:© 1965 University of Michigan. Contribution No. 1345, Division of Geological Sciences, California Institute of Technology, Pasadena. This research was supported by the Advanced Research Projects Agency and was monitored by the Air Force Office of Scientific Research under Contract AF 49(638)-1337.
Funding AgencyGrant Number
Advanced Research Projects Agency (ARPA)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)AF 49(638)-1337
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Caltech Division of Geological Sciences1345
Record Number:CaltechAUTHORS:20130124-104506282
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36565
Deposited By: Tony Diaz
Deposited On:25 Jun 2013 18:42
Last Modified:03 Oct 2019 04:39

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